let NetUtil = {
  postJson(url, data, callback){
     var fetchOptions = {
      method: 'POST',
      headers: {
       'Accept': 'application/json',
       'Content-Type': 'multipart/form-data;boundary=6ff46e0b6b5148d984f148b6542e5a5d'
      },
      body:data
     };
 
     fetch(url, fetchOptions)
     .then((response) => response.text())
     .then((responseText) => {
      // callback(JSON.parse(responseText));
       callback(responseText);
     }).done();
  },
 }
 export default NetUtil;
 
 